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Author SHA1 Message Date
Chris Lattner
8c86882a99 Implement constant folding of undef values. 
llvm-svn: 17070
 2004-10-16 23:31:32 +00:00
Chris Lattner
68f14bc09c Fix a type violation 
llvm-svn: 17069
 2004-10-16 23:28:04 +00:00
Nate Begeman
d4c970aa3d Finally fix one of the oldest FIXMEs in the PowerPC backend: correctly 
flag rotate left word immediate then mask insert (rlwimi) as a two-address
instruction, and update the ISel usage of the instruction accordingly.

This will allow us to properly schedule rlwimi, and use it to efficiently
codegen bitfield operations.

llvm-svn: 17068
 2004-10-16 20:43:38 +00:00
Chris Lattner
d12442c206 Kill the bogon that slipped into my buffer before I committed. 
llvm-svn: 17067
 2004-10-16 19:46:33 +00:00
Chris Lattner
b55574181d Implement InstCombine/getelementptr.ll:test9, which is the source of many 
ugly and giant constnat exprs in some programs.

llvm-svn: 17066
 2004-10-16 19:44:59 +00:00
Chris Lattner
f9967959be New testcase, rework testcases to fail if there are any gep's other than those 
involving %B instead of allowing any geps except %A's.

llvm-svn: 17065
 2004-10-16 19:44:23 +00:00
Misha Brukman
39dc670ee6 * Add a space between words 
* Wrap at 80 cols

llvm-svn: 17064
 2004-10-16 19:13:58 +00:00
Chris Lattner
a0019a2104 Do not erroneously accept revision 6 bytecode files when the format hasn't 
been defined yet!

llvm-svn: 17063
 2004-10-16 18:56:02 +00:00
Chris Lattner
6f712ca382 Update release notes 
llvm-svn: 17062
 2004-10-16 18:35:57 +00:00
Chris Lattner
143d44cb1a New testcase 
llvm-svn: 17061
 2004-10-16 18:28:01 +00:00
Chris Lattner
51278a2460 Add support for undef and unreachable 
llvm-svn: 17059
 2004-10-16 18:24:35 +00:00
Chris Lattner
7900435c81 testcases for undefined and unreachable 
llvm-svn: 17058
 2004-10-16 18:24:11 +00:00
Chris Lattner
3a1215ce83 Fix fix fix 
llvm-svn: 17057
 2004-10-16 18:21:50 +00:00
Chris Lattner
2fae8a1ef9 Add support for unreachable 
llvm-svn: 17056
 2004-10-16 18:21:33 +00:00
Chris Lattner
8d479b62ad Add support for undef 
llvm-svn: 17055
 2004-10-16 18:19:26 +00:00
Chris Lattner
8336590b1f Add support for undef, unreachable, and function flags 
llvm-svn: 17054
 2004-10-16 18:18:16 +00:00
Chris Lattner
eb973c8226 Parse undef and unreachable 
llvm-svn: 17053
 2004-10-16 18:17:13 +00:00
Chris Lattner
cbdf19fed2 Add support 
llvm-svn: 17052
 2004-10-16 18:16:19 +00:00
Chris Lattner
5fac2c8212 Add support for undef and unreachable 
llvm-svn: 17051
 2004-10-16 18:14:10 +00:00
Chris Lattner
3662abfd5a ADd support for undef and unreachable 
llvm-svn: 17050
 2004-10-16 18:13:47 +00:00
Chris Lattner
ae2e5f4de1 Teach the X86 backend about unreachable and undef. Among other things, we 
now compile:

'foo() {}' into "ret" instead of "mov EAX, 0; ret"

llvm-svn: 17049
 2004-10-16 18:13:05 +00:00
Chris Lattner
08ad95ec1f Add support for unreachable and undef 
llvm-svn: 17048
 2004-10-16 18:12:13 +00:00
Chris Lattner
3ebca6fb19 Optimize instructions involving undef values. For example X+undef == undef. 
llvm-svn: 17047
 2004-10-16 18:11:37 +00:00
Chris Lattner
4fca8caaee Add support for UndefValue 
llvm-svn: 17046
 2004-10-16 18:10:31 +00:00
Chris Lattner
ca01f160ee When promoting mem2reg, make uninitialized values become undef isntead of 0. 
llvm-svn: 17045
 2004-10-16 18:10:06 +00:00
Chris Lattner
80f963c30b Handle undef values as undefined on the constant lattice 
ignore unreachable instructions

llvm-svn: 17044
 2004-10-16 18:09:41 +00:00
Chris Lattner
c630ba08cf Add note 
llvm-svn: 17043
 2004-10-16 18:09:25 +00:00
Chris Lattner
4a37579191 Add support for the undef value. Implement a new optimization based on globals 
that are initialized with undef.  When promoting malloc to a global, start out
initialized to undef

llvm-svn: 17042
 2004-10-16 18:09:00 +00:00
Chris Lattner
93bf5a8066 Add support for undef and unreachable 
llvm-svn: 17041
 2004-10-16 18:08:06 +00:00
Chris Lattner
8824a5ee1c Implement UndefValue class 
llvm-svn: 17040
 2004-10-16 18:07:16 +00:00
Chris Lattner
cd83905b39 Add support for the unreachable instruction 
llvm-svn: 17039
 2004-10-16 18:06:43 +00:00
Chris Lattner
6dd0bb3d27 Add new UndefValueVal type 
llvm-svn: 17038
 2004-10-16 18:06:07 +00:00
Chris Lattner
423a692a5b Add new UnreachableInst class 
llvm-svn: 17037
 2004-10-16 18:05:54 +00:00
Chris Lattner
88ba528955 Add new unreachable instruction 
llvm-svn: 17036
 2004-10-16 18:05:37 +00:00
Chris Lattner
1217610926 Add new UndefValue class 
llvm-svn: 17035
 2004-10-16 18:05:25 +00:00
Chris Lattner
56508557cf UndefValue's are constants 
llvm-svn: 17034
 2004-10-16 18:05:10 +00:00
Chris Lattner
c398679263 Document unreachable instruction 
llvm-svn: 17033
 2004-10-16 18:04:13 +00:00
Chris Lattner
249926bf4e Add missing 'Instruction Opcodes' bullet to TOC 
Update for changes in LLVM 1.4 bytecode format.

llvm-svn: 17032
 2004-10-16 18:03:55 +00:00
Chris Lattner
72d8078a36 Add a missing dependency 
llvm-svn: 17031
 2004-10-16 17:12:55 +00:00
Chris Lattner
b1e427f563 Fix file header 
llvm-svn: 17030
 2004-10-16 16:37:42 +00:00
Chris Lattner
b3a86dc93f Be more careful about looking for constants when we really want constantint's. 
llvm-svn: 17029
 2004-10-16 16:07:10 +00:00
Chris Lattner
099bc9571a None of these have actually been implemented yet. 
llvm-svn: 17027
 2004-10-16 00:29:30 +00:00
Chris Lattner
d3844cc216 Move the implementation of the instructions clone methods to this file so 
that the vtables for these classes are only instantiated in this translation
unit, not in every xlation unit they are used.

llvm-svn: 17026
 2004-10-15 23:52:53 +00:00
Chris Lattner
b222ad66ef Move the implementation of the clone method for these classes to 
Instructions.cpp, so that a vtable is not emitted into every translation unit
that uses the classes.

llvm-svn: 17025
 2004-10-15 23:52:05 +00:00
Misha Brukman
f63dddc787 Fix hyphenation and quoting style for great justice 
llvm-svn: 17024
 2004-10-15 23:22:48 +00:00
Chris Lattner
33dd5f87b8 There is no reason not to build these in parallel 
llvm-svn: 17023
 2004-10-15 23:22:15 +00:00
Misha Brukman
209f5ea32b Add a space between the type and name of value when printing error message 
llvm-svn: 17022
 2004-10-15 23:08:50 +00:00
Chris Lattner
b346be57a2 Don't print a bunch of metrics that are meaningless for external functions 
llvm-svn: 17017
 2004-10-15 19:40:31 +00:00
Chris Lattner
45eac7ddf7 Fix broken links 
llvm-svn: 17016
 2004-10-15 17:04:28 +00:00
Chris Lattner
25b5777485 Instruction select globals with offsets better. For example, on this test 
case:

int C[100];
int foo() {
  return C[4];
}

We now codegen:

foo:
        mov %EAX, DWORD PTR [C + 16]
        ret

instead of:

foo:
        mov %EAX, OFFSET C
        mov %EAX, DWORD PTR [%EAX + 16]
        ret

Other impressive features may be coming later.

This patch is contributed by Jeff Cohen!

llvm-svn: 17011
 2004-10-15 05:05:29 +00:00